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Transcript
© Boardworks Ltd 2003 Teacher’s Notes A slide contains teacher’s notes wherever this icon is displayed - To access these notes go to ‘Notes Page View’ (PowerPoint 97) or ‘Normal View’ (PowerPoint 2000). Notes Page View Normal View Flash Files A flash file has been embedded into the PowerPoint slide wherever this icon is displayed – These files are not editable. © Boardworks Ltd 2003 As the name suggests, MICROBES are microscopic organisms. They can only be seen using a microscope. © Boardworks Ltd 2003 Microbe uses Microbe can be put into a number of categories. The three types which you need to know about are listed below: BACTERIA VIRUS FUNGI Note: A living organism must be able to demonstrate that it can perform ALL the 7 life processes. Movement Respiration Sensitivity Growth Reproduction Excretion Nutrition © Boardworks Ltd 2003 Microbe pictures Microbes multiply very rapidly. Two can, very quickly, become four then eight and so on. © Boardworks Ltd 2003 Microbe uses Microbes have many uses. This is mainly because we can ‘grow’ microbes if we wish to. Microbes (in this case bacteria) will grow in milk to make it ‘go off’. This is used in the yoghurt making process. Cheese is also another product made due to the use of microbes in industry. Another type of microbe (fungi) are used to make Quorn (mycoprotein) which is a commonly used meat substitute. © Boardworks Ltd 2003 Microbe uses Yeast is a microbe which RESPIRES to give off carbon dioxide. This is used in baking bread and in winemaking. We can use the AEROBIC respiration of yeast to make bread rise. Yeast uses the sugar in bread dough to respire. The reaction is: Glucose + oxygen carbon + water + energy dioxide The carbon dioxide given off causes the bread to rise. © Boardworks Ltd 2003 Microbe uses We can use the ANAEROBIC respiration of yeast to make beer and wine. This means that the yeast respires WITHOUT oxygen. This process produces alcohol (ethanol) and is known as FERMENTATION. Yeast converts the sugar into alcohol: Glucose carbon + ethanol + energy dioxide © Boardworks Ltd 2003 Virus A virus is a simple organism which does not completely display ALL the characteristics of living things. It consists of a protein coating and a strand of genes. © Boardworks Ltd 2003 Bacteria A bacteria is a single celled organism which does not completely have a nucleus. Their genes are found in the chromosomes. © Boardworks Ltd 2003 Fungus Yeast is a fungus and as can be seen below, it has a more complex structure than the other two types of microbes. © Boardworks Ltd 2003 Microbes can cause disease The diseases and their severity caused by microbes depend on the type of microbe. Some of these are listed below. VIRUSES BACTERIA FUNGI Influenza (flu) Food poisoning fungal sinusitis Mumps Sore throats Athletes foot Chickenpox Tuberculosis (TB) Smallpox Tetanus Onychomycosis Causes discoloured toe nails Polio Cholera Rabies Typhoid German measles Whooping cough Viral meningitis Bacterial meningitis © Boardworks Ltd 2003 How do microbes enter the body Eyes Ears Mouth Nose Skin Cuts Genitals A number of these places where microbes can enter the body are defended. © Boardworks Ltd 2003 How do microbes spread? The spreading of microbes and disease is known as Transmission. • Transmission by air A cough or a sneeze can release millions of microbes into the air which could then infect somebody else. • Transmission in water Dirty water can transmit many diseases, for example, cholera which can be transmitted by drinking the water. © Boardworks Ltd 2003 • Transmission by animals An animal, e.g. a mosquito (which spreads the MALARIA PARASITE) can carry the microbe from one place to another. • Transmission by contact Many microbes can be exchanged from one person to another by direct or indirect contact: • Direct contact by hand. • Indirect contact by walking on a wet floor already contaminated by someone else who has Athlete’s foot. • Sexual contact. © Boardworks Ltd 2003 • Transmission by contact There are other forms of indirect contact, the transmission of microbes from mother to unborn child. Transmission through the Placenta If the mother develops the HIV/aids infection, it can be passed on to the unborn child through the placenta. Transmission via Breastfeeding A child can also pick up microbes from the mother, via the milk, if the child is being breastfed. © Boardworks Ltd 2003 How do we stop microbes spreading disease We can prevent the spread of disease by making sure that good hygiene is used in key places such as bathrooms and kitchens. Chemicals called antibiotics can be used to treat bacterial infections. People can be immunised against some diseases by the injection of a vaccine. © Boardworks Ltd 2003 Fighting disease © Boardworks Ltd 2003 Fighting disease © Boardworks Ltd 2003